How can I create charts with Graphviz? I can't find any examples...
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jesperApr 5 '11 at 10:48

... that's because apparently I'm an idiot, and several people were as caffeine deprived as me when I answered the question. GraphVis is more for hierarchical/node based graphs, not bar graphs and pie charts. I've added a more sane answer below that should be vastly more useful to you. (although GraphVis is exceptionally good at what it does do)
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NerdfestApr 5 '11 at 20:39